Skip to content
Fencer Vulns
medium 6.3

CVE-2026-73051 json

actix-http before 3.12.1 HTTP Request Smuggling via CL.TE

published 2026-04-22 6 mo ago modified 2026-10-29 10 d ago also GHSA-xhj4-vrgc-hr34 , EUVD-2026-58619

cvss
6.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

actix-http versions before 3.12.1 contain an HTTP request smuggling vulnerability in the HTTP/1.1 parser that accepts requests with both Content-Length and Transfer-Encoding: chunked headers. Unauthenticated remote attackers can exploit this through a front-end intermediary to desynchronize backend requests and smuggle malicious HTTP requests to the Actix service.

Patch / fix

  • crates.io actix-http 3.12.1
  • actix actix-http 3.12.1
  • rust-actix-http Debian 14 3.13.1-1

debian advisories DEBIAN-CVE-2026-73051

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73051 updated cvss 5.3

actix-http: Actix-http: HTTP Request Smuggling via malformed HTTP/1.1 headers

  • Red Hat Enterprise Linux 9 keylime-agent-rust, keylime-agent-rust 0.2.7-2.el10 Red Hat Enterprise Linux 10 trustee 0.15.0-2.el10, keylime-agent-rust 0.2.7-2.el10 Red Hat OpenShift Update Service openshift-update-service/openshift-update-service-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9 Red Hat Connectivity Link 1 rhcl-1/limitador-rhel9
    not affected: vulnerable code not present
  • Red Hat Hardened Images rust 1.97.1-2.hum1
    not affected: component not present
  • Red Hat Trusted Profile Analyzer rhtpa/rhtpa-rhel10, rhtpa/rhtpa-trustification-service-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
crates.io actix-http
<3.12.1
3.12.1

Affected products

  • actix actix-http

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.